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OMG, NAT, locally originated traffic is treated as crossing in to the router from an outside interface. posted 10/10/2006
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I am 100% sure at this point.

R2/e0---------e0/R1

Not one of the interfaces is marked "ip nat inside" our "ip nat outside"

R1:
interface Ethernet1
 ip address 1.1.12.1 255.255.255.0

R2:
interface Ethernet0                                                             
 ip address 1.1.12.2 255.255.255.0
ip nat inside source static 1.1.12.1 1.1.2.20

r3_R2#ping 1.1.2.20 repeat 1                                                    
                                                                                
Type escape sequence to abort.                                                  
Sending 1, 100-byte ICMP Echos to 1.1.2.20, timeout is 2 seconds:               
!                                                                               
Success rate is 100 percent (1/1), round-trip min/avg/max = 24/24/24 ms         
r3_R2#
*Mar  1 00:33:08.011: IP: s=1.1.2.2 (local), d=1.1.12.1 (Ethernet0), len 100, sending
*Mar  1 00:33:08.027: IP: s=1.1.12.1 (Ethernet0), d=1.1.2.2, len 100, rcvd 4